Wide-bandwidth guided-wave electro-optic intensity modulator at λ=3.39 μm

Becker, R. A.; Rediker, R. H.; Lind, T. A.
May 1985
Applied Physics Letters;5/1/1985, Vol. 46 Issue 9, p809
Academic Journal
A Ti-indiffused guided-wave interferometric modulator has been demonstrated at λ = 3.39 µm with a linear small-signal 3-dB bandwidth of 1.8 GHz. This is the first interferometric modulator operating at λ > 1.6 µm. An extinction ratio of 18.9 dB was obtained with Vπ = 31 V for TEpolarized radiation. This value of Vπ is consistent with predictions based upon λ = 0.85 µm modulator data and simple λ² scaling rules, indicating little dispersion in the electro-optical coefficients of LiNbO[sub 3] over the 0.85-3.39 µm region. Such modulators are important components for the long-distance repeaterless data links which is the goal of the large effort in the development of ultra-low-loss fibers at the longer wavelengths.


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